/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 *  strict-local
 * @format
 */

"use strict";
function _asyncToGenerator(fn) {
  return function() {
    var gen = fn.apply(this, arguments);
    return new Promise(function(resolve, reject) {
      function step(key, arg) {
        try {
          var info = gen[key](arg);
          var value = info.value;
        } catch (error) {
          reject(error);
          return;
        }
        if (info.done) {
          resolve(value);
        } else {
          return Promise.resolve(value).then(
            function(value) {
              step("next", value);
            },
            function(err) {
              step("throw", err);
            }
          );
        }
      }
      return step("next");
    });
  };
}

const DeltaCalculator = require("./DeltaBundler/DeltaCalculator");

/**
 * `DeltaBundler` uses the `DeltaTransformer` to build bundle deltas. This
 * module handles all the transformer instances so it can support multiple
 * concurrent clients requesting their own deltas. This is done through the
 * `clientId` param (which maps a client to a specific delta transformer).
 */
class DeltaBundler {
  constructor(bundler) {
    this._deltaCalculators = new Map();
    this._bundler = bundler;
  }

  end() {
    this._deltaCalculators.forEach(deltaCalculator => deltaCalculator.end());
    this._deltaCalculators = new Map();
  }

  buildGraph(entryPoints, options) {
    var _this = this;
    return _asyncToGenerator(function*() {
      const depGraph = yield _this._bundler.getDependencyGraph();

      const deltaCalculator = new DeltaCalculator(
        entryPoints,
        depGraph,
        options
      );

      yield deltaCalculator.getDelta({ reset: true });
      const graph = deltaCalculator.getGraph();

      _this._deltaCalculators.set(graph, deltaCalculator);

      return graph;
    })();
  }

  getDelta(graph, _ref) {
    var _this2 = this;
    let reset = _ref.reset;
    return _asyncToGenerator(function*() {
      const deltaCalculator = _this2._deltaCalculators.get(graph);

      if (!deltaCalculator) {
        throw new Error("Graph not found");
      }

      return yield deltaCalculator.getDelta({ reset });
    })();
  }

  listen(graph, callback) {
    const deltaCalculator = this._deltaCalculators.get(graph);

    if (!deltaCalculator) {
      throw new Error("Graph not found");
    }

    deltaCalculator.on("change", callback);
  }

  endGraph(graph) {
    const deltaCalculator = this._deltaCalculators.get(graph);

    if (!deltaCalculator) {
      throw new Error("Graph not found");
    }

    deltaCalculator.end();

    this._deltaCalculators.delete(graph);
  }
}

module.exports = DeltaBundler;
